/*jshint multistr:true, curly: false */
/*global jQuery:false, define: false */
/**
 * jRange - Awesome range control
 *
 * Written by
 * ----------
 * Nitin Hayaran (nitinhayaran@gmail.com)
 *
 * Licensed under the MIT (MIT-LICENSE.txt).
 *
 * @author Nitin Hayaran
 * @version 0.1-RELEASE
 *
 * Dependencies
 * ------------
 * jQuery (http://jquery.com)
 *
 **/
 ;
 (function($, window, document, undefined) {
	'use strict';

	var jRange = function(){
		return this.init.apply(this, arguments);
	};
	jRange.prototype = {
		defaults : {
			onstatechange : function(){},
			isRange : false,
			showLabels : true,
			showScale : true,
			step  : 1,
			format: '%s',
			theme : 'theme-green',
			width : 300
		},
		template : '<div class="slider-container">\
			<div class="back-bar">\
                <div class="left-bar"></div>\
                <div class="right-bar"></div>\
                <div class="selected-bar"></div>\
                <div class="pointer low"></div><div class="pointer-label">123456</div>\
                <div class="pointer high"></div><div class="pointer-label">456789</div>\
                <div class="clickable-dummy"></div>\
            </div>\
            <div class="scale"></div>\
		</div>',
		init : function(node, options){
			this.options       = $.extend({}, this.defaults, options);
			this.inputNode     = $(node);
			this.options.value = this.inputNode.val() || (this.options.isRange ? this.options.from+','+this.options.from : this.options.from);
			this.domNode       = $(this.template);
			this.domNode.addClass(this.options.theme);
			this.inputNode.after(this.domNode);
			this.domNode.on('change', this.onChange);
			this.pointers     = $('.pointer', this.domNode);
			this.lowPointer   = this.pointers.first();
			this.highPointer  = this.pointers.last();
			this.labels       = $('.pointer-label', this.domNode);
			this.lowLabel     = this.labels.first();
			this.highLabel    = this.labels.last();
			this.scale        = $('.scale', this.domNode);
			this.bar          = $('.selected-bar', this.domNode);
			this.leftBar      = $('.left-bar', this.domNode);
			this.rightBar     = $('.right-bar', this.domNode);
			this.clickableBar = this.domNode.find('.clickable-dummy');
			this.interval     = this.options.to - this.options.from;
			this.render();
		},
		render: function(){
			// Check if inputNode is visible, and have some width, so that we can set slider width accordingly.
			if( this.inputNode.width() === 0 && !this.options.width ){
				console.log('jRange : no width found, returning');
				return;
			}else{
				this.domNode.width( this.options.width || this.inputNode.width() );
				this.inputNode.hide();
			}

			if(this.isSingle()){
				this.lowPointer.hide();
				this.lowLabel.hide();
			}
			if(!this.options.showLabels){
				this.labels.hide();
			}
			this.attachEvents();
			if(this.options.showScale){
				this.renderScale();
			}
			this.setValue(this.options.value);
		},
		isSingle: function(){
			if(typeof(this.options.value) === 'number'){
				return true;
			}
			return (this.options.value.indexOf(',') !== -1 || this.options.isRange) ?
					false : true;
		},
		attachEvents: function(){
			this.clickableBar.click($.proxy(this.barClicked, this));
			this.pointers.mousedown($.proxy(this.onDragStart, this));
			this.pointers.bind('dragstart', function(event) { event.preventDefault(); });
		},
		onDragStart: function(e){
			if(e.which !== 1){return;}
			e.stopPropagation(); e.preventDefault();
			var pointer = $(e.target);
			pointer.addClass('focused');
			this[(pointer.hasClass('low')?'low':'high') + 'Label'].addClass('focused');
			$(document).on('mousemove.slider', $.proxy(this.onDrag, this, pointer));
			$(document).on('mouseup.slider', $.proxy(this.onDragEnd, this));
		},
		onDrag: function(pointer, e){
			e.stopPropagation(); e.preventDefault();
			var position = e.clientX - this.domNode.offset().left;
			this.domNode.trigger('change', [this, pointer, position]);
		},
		onDragEnd: function(){
			this.pointers.removeClass('focused');
			this.labels.removeClass('focused');
			$(document).off('.slider');
			$(document).off('.slider');
		},
		barClicked: function(e){
			var x = e.pageX - this.clickableBar.offset().left;
			if(this.isSingle())
				this.setPosition(this.pointers.last(), x, true, true);
			else{
				var pointer = Math.abs(parseInt(this.pointers.first().css('left'), 10) - x + this.pointers.first().width() / 2) < Math.abs(parseInt(this.pointers.last().css('left'), 10) - x + this.pointers.first().width() / 2) ?
					this.pointers.first() : this.pointers.last();
				this.setPosition(pointer, x, true, true);
			}
		},
		onChange: function(e, self, pointer, position){
			var min, max;
			if(self.isSingle()){
				min = 0;
				max = self.domNode.width();
			}else{
				min = pointer.hasClass('high')? self.lowPointer.position().left + self.lowPointer.width() / 2 : 0;
				max = pointer.hasClass('low') ? self.highPointer.position().left + self.highPointer.width() / 2 : self.domNode.width();
			}
			var value = Math.min(Math.max(position, min), max);
			self.setPosition(pointer, value, true);
		},
		setPosition: function(pointer, position, isPx, animate){
			var leftPos,
				lowPos = this.lowPointer.position().left,
				highPos = this.highPointer.position().left,
				circleWidth = this.highPointer.width() / 2;
			if(!isPx){
				position = this.prcToPx(position);
			}
			if(pointer[0] === this.highPointer[0]){
				highPos = Math.round(position  - circleWidth);
			}else{
                lowPos = Math.round(position  - circleWidth);
			}
            pointer[animate?'animate':'css']({'left': Math.round(position  - circleWidth)});
			if(this.isSingle()){
				leftPos = 0;
			}else{
				leftPos = lowPos + circleWidth;
			}
			this.bar[animate?'animate':'css']({
					'width' : Math.round(highPos + circleWidth - leftPos),
					'left'	: leftPos
				});
			this.leftBar[animate?'animate':'css']({
				'width' : leftPos,
				'left'	: 0
			});
			this.rightBar[animate?'animate':'css']({
				//'width' : self.domNode.width(),
				'width': this.options.width - highPos,
				'left'	: highPos
			});
			this.showPointerValue(pointer, position, animate);
		},
		// will be called from outside
		setValue: function(value){
			var values = value.toString().split(',');
			this.options.value = value;
			var prc = this.valuesToPrc( values.length === 2 ? values : [0, values[0]] );
			if(this.isSingle()){
				this.setPosition(this.highPointer, prc[1]);
			}else{
				this.setPosition(this.lowPointer, prc[0]);
				this.setPosition(this.highPointer, prc[1]);
			}
		},
		renderScale: function(){
			var s = this.options.scale || [this.options.from, this.options.to];
			var prc = Math.round((100 / (s.length - 1)) * 10) / 10;
			var str = '';
			for(var i = 0; i < s.length ; i++ ){
				str += '<span style="left: ' + i * prc + '%">' + (s[i] != '|' ? '<ins>' + s[i] + '</ins>' : '') + '</span>';
			}
			this.scale.html(str);

			$('ins', this.scale).each(function () {
				$(this).css({
					marginLeft: -$(this).outerWidth() / 2
				});
			});
		},
		getBarWidth: function(){
			var values = this.options.value.split(',');
			if(values.length > 1){
				return parseInt(values[1], 10) - parseInt(values[0], 10);
			}else{
				return parseInt(values[0], 10);
			}
		},
		showPointerValue: function(pointer, position, animate){
			var label = $('.pointer-label', this.domNode)[pointer.hasClass('low')?'first':'last']();
			var text;
			var value = this.positionToValue(position);
			if($.isFunction(this.options.format)){
                var type = this.isSingle() ? undefined : (pointer.hasClass('low') ? 'low':'high');
                text = this.options.format(value, type);
			}else{
				text = this.options.format.replace('%s', value);
			}

			var width = label.html(text).width(),
				left = position - width / 2;
			left = Math.min(Math.max(left, 0), this.options.width - width);
			label[animate?'animate':'css']({left: left});
			this.setInputValue(pointer, value);
		},
		valuesToPrc: function(values){
			var lowPrc = ( ( values[0] - this.options.from ) * 100 / this.interval ),
				highPrc = ( ( values[1] - this.options.from ) * 100 / this.interval );
			return [lowPrc, highPrc];
		},
		prcToPx: function(prc){
			return (this.domNode.width() * prc) / 100;
		},
		positionToValue: function(pos){
			var value = (pos / this.domNode.width()) * this.interval;
			value = value + this.options.from;
			return  Math.round(value / this.options.step) * this.options.step;
		},
		setInputValue: function(pointer, v){
			// if(!isChanged) return;
			if(this.isSingle()){
				this.options.value = v.toString();
			}else{
				var values = this.options.value.split(',');
				if(pointer.hasClass('low')){
					this.options.value = v + ',' + values[1];
				}else{
					this.options.value = values[0] + ',' + v;
				}
			}
			if( this.inputNode.val() !== this.options.value ){
				this.inputNode.val(this.options.value);
				this.options.onstatechange.call(this, this.options.value);
			}
		},
        getValue: function(){
            return this.options.value;
        }
	};

	/*$.jRange = function (node, options) {
		var jNode = $(node);
		if(!jNode.data('jrange')){
			jNode.data('jrange', new jRange(node, options));
		}
		return jNode.data('jrange');
	};

	$.fn.jRange = function (options) {
		return this.each(function(){
			$.jRange(this, options);
		});
	};*/

	var pluginName = 'jRange';
	// A really lightweight plugin wrapper around the constructor,
	// preventing against multiple instantiations
	$.fn[pluginName] = function(option) {
		var args = arguments,
				result;

		this.each(function() {
			var $this = $(this),
				data = $.data(this, 'plugin_' + pluginName),
				options = typeof option === 'object' && option;
			if (!data) {
				$this.data('plugin_' + pluginName, (data = new jRange(this, options)));
			}
			// if first argument is a string, call silimarly named function
			// this gives flexibility to call functions of the plugin e.g.
			//   - $('.dial').plugin('destroy');
			//   - $('.dial').plugin('render', $('.new-child'));
			if (typeof option === 'string') {
				result = data[option].apply(data, Array.prototype.slice.call(args, 1));
			}
		});

		// To enable plugin returns values
		return result || this;
	};

})(jQuery, window, document);